equals() method and object comparing

Question

I was studying basics of java and saw equals() method and wrote this code

public class EqualsTest {
public static void main(String[] args) {
    String str = new String("this");
    String str2 = new String("this");

    Object obj1 = new Object(6);
    Object obj2 = new Object(6);

    System.out.println(str == str2);
    System.out.println(str.equals(str2));

    System.out.println(obj1 == obj2);
    System.out.println(obj1.equals(obj2));
    }
}

and this.

public class Object {
public int num;

public Object(int num) {
    this.num = num;
    }

}

When I run the code, I get the result saying

false
true
false
false

I could understand why I got first two result. (false and true) '==' operator compares whether str and str2 are referencing the same instance and equals() method compares the actual value inside.

However I could not understood why I got false for both

obj1 == obj2;
obj1.equals(obj2);

I thought since they both have the value 6 with them,

obj1.equals(obj2);

this line should've given the true as a result.

Can someone please explain this?

Thank you.